(163348) 2002 NN4

Near-Earth asteroid yes (163348) 2002 NN 4 #FFC2E0 Orbit diagram of (163348) 2002 NN4.png 2002 NN 4 orbits between Venus and Mars LINEAR Lincoln Lab's ETS 9 July 2002 (163348) 2002 NN 4 NEOPHAAten 31 May 2020 (JD 2459000.5) 02 14.16 yr (5,171 d) 1.2572 AU 0.4956 AU 0.8764 AU 0.4345 300 days 83.774° 1.2013 ms / day 5.4177° 259.48° 222.23° 0.0069 AU LD on 3 on 0.613 km 0.735 0.243 km 14.50 0.03 hLightcurve-plot-Warner 0.030 0.027 0.047 X 20.1 (163348) 2002 NN 4 is a dark, sub-kilometer near-Earth object and potentially hazardous asteroid of the Aten group that flew by Earth on 6 June 2020. The highly elongated X-type asteroid has a rotation period of 14.5 hours and measures approximately 0.7 km mi off 1 us in diameter. It was discovered by LINEAR at the Lincoln Laboratory's Experimental Test Site in New Mexico on 9 July 2002. Orbit 2002 NN 4 flew by Earth on 6 June 2020, passing 0.034 AU e6km LD 2 unit on from Earth. The asteroid had been recovered two days earlier on 4 June 2020. By 11 June 2020, the asteroid had brightened to apparent magnitude 14.4, which is roughly the brightness of Pluto. Being a member of the Aten asteroids, 2002 NN 4 orbits the Sun at a distance of 0.50–1.26 AU once every 10 months (300 days; semi-major axis of 0.88 AU). Its orbit has an eccentricity of 0.43 and an inclination of 5° with respect to the ecliptic. It was first observed by the Near-Earth Asteroid Tracking on Palomar Observatory on 2 July 2002, or seven nights prior to its official discovery observation by LINEAR. This asteroid has an Earth minimum orbit intersection distance of 0.0069 AU km on off 3, which corresponds to 2.7 lunar distances (LD). Physical characteristics A spectroscopic survey of the small near-Earth asteroid population conducted by European astronomers determined that 2002 NN 4 is an X-type asteroid. Because of the objects low albedo (see below), it would be considered a primitive P-type asteroid in the Tholen classification. Diameter and albedo According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, 2002 NN 4 measures (735 243) meters in diameter, and its surface has a dark albedo of (0.030 0.027). (The NEOWISE publication uses the designation G3348 for this asteroid.) In 2016, astronomers using the European New Technology Telescope at La Silla Observatory found a diameter of 613 meters with an albedo of 0.047.4 Rotation period In August 2016, the first rotational lightcurve of 2002 NN 4 was obtained from photometric observations over five nights by Brian Warner at the Center for Solar System Studies U82 in California. Lightcurve analysis gave a rotation period of 14.50 0.03 hours with a high brightness variation of 0.74 0.05 magnitude, indicative of a highly elongated shape (U=3−).Lightcurve-plot-Warner Notes Lightcurve-plot-Warner Lightcurve plot of (163348) 2002 NN 4, by Brian Warner at the Center for Solar System Studies (2016). Rotation period of 14.50 0.03 hours with a brightness amplitude of 0.74 0.05 mag. Quality code is 3−. Summary figures at the LCDB and CS3 websites. References 30em 2016-08-28 last obs. JPL Small-Body Database Browser: 163348 (2002 NN4) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2163348;cad=1 Jet Propulsion Laboratory 8 June 2020 163348 (2002 NN4) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=163348 8 June 2020 No, we're not in any danger from an asteroid passing Earth on Saturday night Bad Astronomy Plait, Phil 4 June 2020 https://www.syfy.com/syfywire/no-were-not-in-any-danger-from-an-asteroid-passing-earth-on-saturday-night 9 June 2020 (Neowise Table) 163348 8 June 2020 6 Joseph R. Masiero C. Nugent A. K. Mainzer E. L. Wright J. M. Bauer R. M. Cutri T. Grav E. Kramer S. Sonnett October 2017 NEOWISE Reactivation Mission Year Three: Asteroid Diameters and Albedos The Astronomical Journal 154 4 10 2017AJ....154..168M 10.3847/1538-3881/aa89ec 1708.09504 45334910 free Warner Brian D. January 2017 Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2016 July–September Minor Planet Bulletin http://www.minorplanet.info/MPB/issues/MPB_44-1.pdf 44 1 22–36 32455389 7243971 2017MPBu...44...22W 1052-8091 2020-06-15 2020-06-15 https://web.archive.org/web/20200615000319/http://www.minorplanet.info/MPB/issues/MPB_44-1.pdf dead 6 Perna D. Barucci M. A. Fulchignoni M. Popescu M. Belskaya I. Fornasier S. Doressoundiram A. Lantz C. Merlin F. August 2018 A spectroscopic survey of the small near-Earth asteroid population: Peculiar taxonomic distribution and phase reddening Planetary and Space Science 157 82–95 2018P&SS..157...82P 0032-0633 10.1016/j.pss.2018.03.008 1803.08953 119426280 External links Stadium-size asteroid will safely fly by Earth tonight, Space.com Small Asteroid to Safely Fly by Earth, NASA Asteroid 163348, Small Body Data Ferret Discovery Circumstances: Numbered Minor Planets (160001)-(165000) – Minor Planet Center 163348 2163348 163348 163348 163348 163348 20200606 19980724